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First results are during `dd if=/dev/sda of=/dev/null bs=4M count=10k iflag=direct`
Second results are during `dd if=/dev/sda of=/dev/null bs=4M count=10k`
Results are from `atopsar -d 5`
12:48:41 disk busy read/s KB/read writ/s KB/writ avque avserv _dsk_
12:53:06 sda 26% 306.6 512.1 0.6 4.0 18.7 0.84 ms
12:53:11 sda 25% 310.4 511.9 0.2 4.0 18.8 0.82 ms
12:53:16 sda 25% 310.9 512.0 0.0 0.0 18.9 0.81 ms
12:54:06 sda 28% 159.8 1007.3 0.0 0.0 6.7 1.72 ms
12:54:11 sda 26% 153.3 1023.3 0.6 5.3 7.1 1.68 ms
12:54:16 sda 28% 157.1 1015.2 0.0 0.0 6.5 1.78 ms
12:54:21 sda 27% 155.7 1024.3 0.0 0.0 6.8 1.71 ms
$ sudo dd if=/dev/sda of=/dev/null bs=1M count=10k iflag=direct # in a background terminal
$ sudo iotop -d 5
Total DISK READ : 154.65 M/s | Total DISK WRITE : 0.00 B/s
Actual DISK READ: 154.65 M/s | Actual DISK WRITE: 812.12 B/s
TID PRIO USER DISK READ DISK WRITE SWAPIN IO> COMMAND
7398 be/4 root 154.65 M/s 0.00 B/s 0.00 % 97.75 % dd if=/de~lag=direct
1 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % systemd -~rialize 32
2 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [kthreadd]
3 be/0 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [rcu_gp]
...
$ sudo parted --list
Model: ATA WDC WD5000LPLX-7 (scsi)
Disk /dev/sda: 500GB
Sector size (logical/physical): 512B/4096B
Partition Table: gpt
Disk Flags:
Number Start End Size File system Name Flags
1 1049kB 525MB 524MB fat32 EFI System Partition boot, esp
2 525MB 660MB 134MB Microsoft reserved partition msftres
3 660MB 54.9GB 54.2GB ntfs msftdata
6 54.9GB 56.0GB 1074MB ext4
7 56.0GB 455GB 399GB lvm
4 491GB 492GB 472MB ntfs hidden, diag
5 492GB 500GB 8191MB ntfs hidden, diag
$ sudo lshw
alan-laptop
description: Laptop
product: Latitude E5450 (062B)
vendor: Dell Inc.
serial: G4F9J72
width: 64 bits
capabilities: smbios-2.8 dmi-2.8 smp vsyscall32
configuration: administrator_password=disabled boot=normal chassis=laptop frontpanel_password=disabled keyboard_password=disabled power-on_password=disabled sku=062B uuid=44454C4C-3400-1046-8039-C7C04F4A3732
*-core
description: Motherboard
product: 0C7K68
vendor: Dell Inc.
physical id: 0
version: A06
serial: /G4F9J72/CN1296355D002F/
*-firmware
description: BIOS
vendor: Dell Inc.
physical id: 0
version: A15
date: 05/09/2017
size: 64KiB
capacity: 12MiB
capabilities: pci pnp upgrade shadowing cdboot bootselect edd int13floppy1200 int13floppy720 int13floppy2880 int5printscreen int9keyboard int14serial int17printer acpi usb smartbattery biosbootspecification netboot uefi
*-cpu
description: CPU
product: Intel(R) Core(TM) i5-5300U CPU @ 2.30GHz
vendor: Intel Corp.
physical id: 4d
bus info: cpu@0
version: Intel(R) Core(TM) i5-5300U CPU @ 2.30GHz
serial: NULL
slot: SOCKET 0
size: 2393MHz
capacity: 2900MHz
width: 64 bits
clock: 100MHz
capabilities: lm fpu fpu_exception wp vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp x86-64 constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm 3dnowprefetch cpuid_fault epb invpcid_single pti ssbd ibrs ibpb stibp tpr_shadow vnmi flexpriority ept vpid ept_ad fsgsbase tsc_adjust bmi1 hle avx2 smep bmi2 erms invpcid rtm rdseed adx smap intel_pt xsaveopt dtherm ida arat pln pts flush_l1d cpufreq
configuration: cores=2 enabledcores=2 threads=4
*-cache:0
description: L1 cache
physical id: 3e
slot: L1 Cache
size: 32KiB
capacity: 32KiB
capabilities: synchronous internal write-back instruction
configuration: level=1
*-cache:1
description: L2 cache
physical id: 43
slot: L2 Cache
size: 256KiB
capacity: 256KiB
capabilities: synchronous internal write-back unified
configuration: level=2
*-cache:2
description: L3 cache
physical id: 48
slot: L3 Cache
size: 3MiB
capacity: 3MiB
capabilities: synchronous internal write-back unified
configuration: level=3
*-cache
description: L1 cache
physical id: 39
slot: L1 Cache
size: 32KiB
capacity: 32KiB
capabilities: synchronous internal write-back data
configuration: level=1
*-memory
description: System Memory
physical id: 52
slot: System board or motherboard
size: 8GiB
*-bank:0
description: SODIMM DDR3 Synchronous 1600 MHz (0.6 ns)
product: HMT41GS6BFR8A-PB
vendor: Hynix/Hyundai
physical id: 0
serial: 9BADED81
slot: DIMM A
size: 8GiB
width: 64 bits
clock: 1600MHz (0.6ns)
*-bank:1
description: DIMM [empty]
physical id: 1
slot: DIMM B
*-pci
description: Host bridge
product: Broadwell-U Host Bridge -OPI
vendor: Intel Corporation
physical id: 100
bus info: pci@0000:00:00.0
version: 09
width: 32 bits
clock: 33MHz
configuration: driver=bdw_uncore
resources: irq:0
*-display
description: VGA compatible controller
product: HD Graphics 5500
vendor: Intel Corporation
physical id: 2
bus info: pci@0000:00:02.0
version: 09
width: 64 bits
clock: 33MHz
capabilities: msi pm vga_controller bus_master cap_list rom
configuration: driver=i915 latency=0
resources: irq:49 memory:f6000000-f6ffffff memory:e0000000-efffffff ioport:f000(size=64) memory:c0000-dffff
*-multimedia:0
description: Audio device
product: Broadwell-U Audio Controller
vendor: Intel Corporation
physical id: 3
bus info: pci@0000:00:03.0
version: 09
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list
configuration: driver=snd_hda_intel latency=0
resources: irq:53 memory:f723c000-f723ffff
*-generic
description: Signal processing controller
product: Broadwell-U Processor Thermal Subsystem
vendor: Intel Corporation
physical id: 4
bus info: pci@0000:00:04.0
version: 09
width: 64 bits
clock: 33MHz
capabilities: msi pm cap_list
configuration: driver=proc_thermal latency=0
resources: irq:16 memory:f7230000-f7237fff
*-usb:0
description: USB controller
product: Wildcat Point-LP USB xHCI Controller
vendor: Intel Corporation
physical id: 14
bus info: pci@0000:00:14.0
version: 03
width: 64 bits
clock: 33MHz
capabilities: pm msi xhci bus_master cap_list
configuration: driver=xhci_hcd latency=0
resources: irq:47 memory:f7220000-f722ffff
*-usbhost:0
product: xHCI Host Controller
vendor: Linux 5.0.9-200.fc29.x86_64 xhci-hcd
physical id: 0
bus info: usb@2
logical name: usb2
version: 5.00
capabilities: usb-2.00
configuration: driver=hub slots=11 speed=480Mbit/s
*-usb DISABLED
description: Ethernet interface
product: Dell Wireless 5809e Gobi
vendor: Sierra Wireless, Incorporated
physical id: 8
bus info: usb@2:8
logical name: wwp0s20u8c2i12
version: 0.06
serial: 82:5d:a0:c4:d0:be
capabilities: usb-2.00 ethernet physical
configuration: broadcast=yes driver=cdc_mbim driverversion=22-Aug-2005 firmware=CDC MBIM link=no maxpower=500mA multicast=yes speed=480Mbit/s
*-usbhost:1
product: xHCI Host Controller
vendor: Linux 5.0.9-200.fc29.x86_64 xhci-hcd
physical id: 1
bus info: usb@3
logical name: usb3
version: 5.00
capabilities: usb-3.00
configuration: driver=hub slots=4 speed=5000Mbit/s
*-communication
description: Communication controller
product: Wildcat Point-LP MEI Controller #1
vendor: Intel Corporation
physical id: 16
bus info: pci@0000:00:16.0
version: 03
width: 64 bits
clock: 33MHz
capabilities: pm msi bus_master cap_list
configuration: driver=mei_me latency=0
resources: irq:46 memory:f7246000-f724601f
*-network
description: Ethernet interface
product: Ethernet Connection (3) I218-LM
vendor: Intel Corporation
physical id: 19
bus info: pci@0000:00:19.0
logical name: eno1
version: 03
serial: 34:e6:d7:6b:a7:56
capacity: 1Gbit/s
width: 32 bits
clock: 33MHz
capabilities: pm msi bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=e1000e driverversion=3.2.6-k firmware=0.2-3 latency=0 link=no multicast=yes port=twisted pair
resources: irq:52 memory:f7200000-f721ffff memory:f7243000-f7243fff ioport:f080(size=32)
*-multimedia:1
description: Audio device
product: Wildcat Point-LP High Definition Audio Controller
vendor: Intel Corporation
physical id: 1b
bus info: pci@0000:00:1b.0
version: 03
width: 64 bits
clock: 33MHz
capabilities: pm msi bus_master cap_list
configuration: driver=snd_hda_intel latency=32
resources: irq:50 memory:f7238000-f723bfff
*-pci:0
description: PCI bridge
product: Wildcat Point-LP PCI Express Root Port #1
vendor: Intel Corporation
physical id: 1c
bus info: pci@0000:00:1c.0
version: e3
width: 32 bits
clock: 33MHz
capabilities: pci pciexpress msi pm normal_decode bus_master cap_list
configuration: driver=pcieport
resources: irq:42 ioport:2000(size=4096) memory:f7100000-f71fffff ioport:df800000(size=2097152)
*-generic
description: SD Host controller
product: SD/MMC Card Reader Controller
vendor: O2 Micro, Inc.
physical id: 0
bus info: pci@0000:01:00.0
version: 01
width: 32 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list
configuration: driver=sdhci-pci latency=0
resources: irq:48 memory:f7101000-f7101fff memory:f7100000-f71007ff
*-pci:1
description: PCI bridge
product: Wildcat Point-LP PCI Express Root Port #4
vendor: Intel Corporation
physical id: 1c.3
bus info: pci@0000:00:1c.3
version: e3
width: 32 bits
clock: 33MHz
capabilities: pci pciexpress msi pm normal_decode bus_master cap_list
configuration: driver=pcieport
resources: irq:43 ioport:3000(size=4096) memory:f7000000-f70fffff ioport:dfa00000(size=2097152)
*-network
description: Wireless interface
product: Wireless 7265
vendor: Intel Corporation
physical id: 0
bus info: pci@0000:02:00.0
logical name: wlp2s0
version: 59
serial: 10:02:b5:4d:e4:0f
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=iwlwifi driverversion=5.0.9-200.fc29.x86_64 firmware=29.1044073957.0 ip=172.16.8.139 latency=0 link=yes multicast=yes wireless=IEEE 802.11
resources: irq:51 memory:f7000000-f7001fff
*-pci:2
description: PCI bridge
product: Wildcat Point-LP PCI Express Root Port #5
vendor: Intel Corporation
physical id: 1c.4
bus info: pci@0000:00:1c.4
version: e3
width: 32 bits
clock: 33MHz
capabilities: pci pciexpress msi pm normal_decode bus_master cap_list
configuration: driver=pcieport
resources: irq:44 ioport:4000(size=4096) memory:dfc00000-dfdfffff ioport:dfe00000(size=2097152)
*-usb:1
description: USB controller
product: Wildcat Point-LP USB EHCI Controller
vendor: Intel Corporation
physical id: 1d
bus info: pci@0000:00:1d.0
version: 03
width: 32 bits
clock: 33MHz
capabilities: pm debug ehci bus_master cap_list
configuration: driver=ehci-pci latency=0
resources: irq:21 memory:f7242000-f72423ff
*-usbhost
product: EHCI Host Controller
vendor: Linux 5.0.9-200.fc29.x86_64 ehci_hcd
physical id: 1
bus info: usb@1
logical name: usb1
version: 5.00
capabilities: usb-2.00
configuration: driver=hub slots=3 speed=480Mbit/s
*-usb
description: USB hub
vendor: Intel Corp.
physical id: 1
bus info: usb@1:1
version: 0.03
capabilities: usb-2.00
configuration: driver=hub slots=8 speed=480Mbit/s
*-usb:0
description: Bluetooth wireless interface
vendor: Intel Corp.
physical id: 3
bus info: usb@1:1.3
version: 0.01
capabilities: bluetooth usb-2.01
configuration: driver=btusb maxpower=100mA speed=12Mbit/s
*-usb:1
description: Video
product: Integrated_Webcam_HD
vendor: CN0FHKK7724875CBCVGDA00
physical id: 6
bus info: usb@1:1.6
version: 47.02
capabilities: usb-2.00
configuration: driver=uvcvideo maxpower=500mA speed=480Mbit/s
*-usb:2 UNCLAIMED
description: Generic USB device
product: 5880
vendor: Broadcom Corp
physical id: 7
bus info: usb@1:1.7
version: 1.01
serial: 0123456789ABCD
capabilities: usb-1.10
configuration: maxpower=100mA speed=12Mbit/s
*-isa
description: ISA bridge
product: Wildcat Point-LP LPC Controller
vendor: Intel Corporation
physical id: 1f
bus info: pci@0000:00:1f.0
version: 03
width: 32 bits
clock: 33MHz
capabilities: isa bus_master cap_list
configuration: driver=lpc_ich latency=0
resources: irq:0
*-raid
description: RAID bus controller
product: 82801 Mobile SATA Controller [RAID mode]
vendor: Intel Corporation
physical id: 1f.2
bus info: pci@0000:00:1f.2
logical name: scsi1
version: 03
width: 32 bits
clock: 66MHz
capabilities: raid msi pm bus_master cap_list emulated
configuration: driver=ahci latency=0
resources: irq:45 ioport:f0d0(size=8) ioport:f0c0(size=4) ioport:f0b0(size=8) ioport:f0a0(size=4) ioport:f060(size=32) memory:f7241000-f72417ff
*-disk
description: ATA Disk
product: WDC WD5000LPLX-7
vendor: Western Digital
physical id: 0.0.0
bus info: scsi@1:0.0.0
logical name: /dev/sda
version: 1A01
serial: WX71A958AN1Y
size: 465GiB (500GB)
capabilities: gpt-1.00 partitioned partitioned:gpt
configuration: ansiversion=5 guid=ac3250de-49de-4ef2-9239-0d1a29531a08 logicalsectorsize=512 sectorsize=4096
*-volume:0
description: Windows FAT volume
vendor: MSDOS5.0
physical id: 1
bus info: scsi@1:0.0.0,1
logical name: /dev/sda1
logical name: /boot/efi
version: FAT32
serial: b895-2186
size: 495MiB
capacity: 499MiB
capabilities: boot fat initialized
configuration: FATs=2 filesystem=fat label=ESP mount.fstype=vfat mount.options=rw,relatime,fmask=0077,dmask=0077,codepage=437,iocharset=ascii,shortname=winnt,errors=remount-ro name=EFI System Partition state=mounted
*-volume:1
description: reserved partition
vendor: Windows
physical id: 2
bus info: scsi@1:0.0.0,2
logical name: /dev/sda2
serial: ab57d50f-2196-4791-9b30-36ddc8179a89
capacity: 127MiB
capabilities: nofs
configuration: name=Microsoft reserved partition
*-volume:2
description: Windows NTFS volume
vendor: Windows
physical id: 3
bus info: scsi@1:0.0.0,3
logical name: /dev/sda3
version: 3.1
serial: 98c9bd83-acee-0e46-87cb-5d39458866e4
size: 50GiB
capacity: 50GiB
capabilities: ntfs initialized
configuration: clustersize=4096 created=2016-12-29 03:00:57 filesystem=ntfs label=OS state=dirty
*-volume:3
description: Windows NTFS volume
vendor: Windows
physical id: 4
bus info: scsi@1:0.0.0,4
logical name: /dev/sda4
version: 3.1
serial: 96d8-012e
size: 443MiB
capacity: 449MiB
capabilities: boot precious ntfs initialized
configuration: clustersize=4096 created=2016-10-18 11:39:02 filesystem=ntfs label=WINRETOOLS state=clean
*-volume:4
description: Windows NTFS volume
vendor: Windows
physical id: 5
bus info: scsi@1:0.0.0,5
logical name: /dev/sda5
version: 3.1
serial: 88d8-b909
size: 7803MiB
capacity: 7811MiB
capabilities: boot precious ntfs initialized
configuration: clustersize=4096 created=2016-10-18 11:39:04 filesystem=ntfs label=Image state=clean
*-volume:5
description: EXT4 volume
vendor: Linux
physical id: 6
bus info: scsi@1:0.0.0,6
logical name: /dev/sda6
logical name: /boot
version: 1.0
serial: b5cef7d1-5d8c-4a12-8316-5ee679fff416
size: 1GiB
capabilities: journaled extended_attributes large_files huge_files dir_nlink recover 64bit extents ext4 ext2 initialized
configuration: created=2016-12-30 18:44:10 filesystem=ext4 lastmountpoint=/boot modified=2019-05-04 16:13:43 mount.fstype=ext4 mount.options=rw,seclabel,relatime mounted=2019-05-02 08:24:16 state=mounted
*-volume:6
description: LVM Physical Volume
vendor: Linux
physical id: 7
bus info: scsi@1:0.0.0,7
logical name: /dev/sda7
serial: DlZ1Co-rz28-Scjf-eK4h-wk0e-dgSy-e1kkVL
size: 167GiB
capacity: 371GiB
capabilities: multi lvm2
*-serial UNCLAIMED
description: SMBus
product: Wildcat Point-LP SMBus Controller
vendor: Intel Corporation
physical id: 1f.3
bus info: pci@0000:00:1f.3
version: 03
width: 64 bits
clock: 33MHz
configuration: latency=0
resources: memory:f7240000-f72400ff ioport:f040(size=32)
*-pnp00:00
product: PnP device PNP0c02
physical id: 1
capabilities: pnp
configuration: driver=system
*-pnp00:01
product: PnP device PNP0b00
physical id: 2
capabilities: pnp
configuration: driver=rtc_cmos
*-pnp00:02
product: PnP device INT3f0d
vendor: Interphase Corporation
physical id: 3
capabilities: pnp
configuration: driver=system
*-pnp00:03
product: PnP device PNP0303
physical id: 4
capabilities: pnp
configuration: driver=i8042 kbd
*-pnp00:04
product: PnP device DLL062b
vendor: Dell Inc
physical id: 5
capabilities: pnp
configuration: driver=i8042 aux
*-pnp00:05
product: PnP device PNP0401
physical id: 6
capabilities: pnp
*-pnp00:06
product: PnP device PNP0c02
physical id: 7
capabilities: pnp
configuration: driver=system
*-pnp00:07
product: PnP device PNP0c02
physical id: 8
capabilities: pnp
configuration: driver=system
*-battery
product: DELL 7FR5JD9
vendor: Samsung SDI
physical id: 1
version: 01/13/2016
serial: 82F5
slot: Sys. Battery Bay
capacity: 51680mWh
configuration: voltage=7.6V
*-network:0
description: Ethernet interface
physical id: 2
logical name: virbr0
serial: 52:54:00:5b:3f:94
capabilities: ethernet physical
configuration: broadcast=yes driver=bridge driverversion=2.3 firmware=N/A ip=192.168.122.1 link=no multicast=yes
*-network:1 DISABLED
description: Ethernet interface
physical id: 3
logical name: virbr0-nic
serial: 52:54:00:5b:3f:94
size: 10Mbit/s
capabilities: ethernet physical
configuration: autonegotiation=off broadcast=yes driver=tun driverversion=1.6 duplex=full link=no multicast=yes port=twisted pair speed=10Mbit/s
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